private void ToolStripMenuItemActiveCategories_Click(object sender, EventArgs e)
 {
     Form_CategoriesManager categoryManager = new Form_CategoriesManager();
     categoryManager.Show();
     categoryManager.Focus();
 }
 private void buttonManageCategories_Cilck(object sender, EventArgs e)
 {
     Form_CategoriesManager form1 = new Form_CategoriesManager();
     form1.Show();
     form1.Focus();
 }